Berion
Developer
There is not any packing software on PS3 side. The best would be connect HDD to PC and copy data directly to another HDD/SSD/SHDD on PC (if You have ERK dumped of course). Remember to not agree to any disk initialization or You will become a reader of my tutorial how to restore partition table.
On Windows use HDD Reader. On Linux You are safe as it is not aggressive, however procedure is much more complicated.